Short answer: the PreSonus Eris Sub 8BT. It ranks #13 of 73 subwoofers by sound quality, rated 3.6/5, at $209.99; the Klipsch Flexus Sub 100 ranks #22, rated 3.4/5, and costs $349, so there is little reason to consider the other one.
The case for the PreSonus Eris Sub 8BT: An affordable, light ported 8 inch subwoofer sized for a small room or a desktop studio setup. The catch: Warranty is a below-average 1 year.
The case for the Klipsch Flexus Sub 100: A compact sealed 10 inch subwoofer made to add bass to a Klipsch Flexus soundbar in a small room. Watch for: Only works with Klipsch Flexus soundbars, not as a standalone LFE sub.
Buy the PreSonus Eris Sub 8BT. It is rated higher for sound quality than the Klipsch Flexus Sub 100 and costs less, so only choose the other one for a particular feature it does better.
Still deciding? The full Subwoofers rankings cover every ranked option.
Prices on this page were last checked November 14, 2026 at 6:17 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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Specifications Side By Side
| PreSonus Eris Sub 8BT | Klipsch Flexus Sub 100 | |
|---|---|---|
| Price | $209.99 | $349.00 |
| Ranked | #13 of 73 in Small Home Subwoofers (Under 30 lbs) | #22 of 73 in Small Home Subwoofers (Under 30 lbs) |
| Enclosure | ported | sealed |
| Output SPL at 20 Hz | 77.7 dB | 90.2 dB |
| Output SPL at 25 Hz | 93.5 dB | 96.7 dB |
| Output SPL at 31.5 Hz | 99.6 dB | 101.2 dB |
| Output SPL at 40 Hz | 105.7 dB | 105.9 dB |
| Output SPL at 50 Hz | 109.4 dB | 109.0 dB |
| Output SPL at 63 Hz | 115.0 dB | 112.4 dB |
| Output SPL at 80 Hz | 115.3 dB | - |
| CEA-2010-A Average (40-80Hz) | 111.3 dB | 109.1 dB (avg of 3/4 bands) |
| Dimensions | 11.7”H x 9.8”W x 12.7”D (297.9 x 249.9 x 323.1 mm) | 13.4”H x 13.2”W x 13.7”D (339.9 x 335.0 x 349.2 mm) |
| Weight | 16.3 lbs (7.4 kg) | 20.7 lbs (9.4 kg) |
| Warranty | 1 | 2/5 |
| Measurement Source | Brent Butterworth | Brent Butterworth |
| Drivers | 8” (203mm) driver | 10” (254mm) driver |
| Country | China | United States |
Where the Ratings Come From
- PreSonus Eris Sub 8BT: manufacturer specifications and listening comparisons; no independent measurement has been published yet.
- Klipsch Flexus Sub 100: manufacturer specifications and listening comparisons; no independent measurement has been published yet.
This comparison is generated from the ratings, specifications and measurements on each product’s own page, and it updates when that data changes. How we rank explains how each rating is decided.
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